These cost-effective swabs are designed for general purpose applications with heads made of 100 PPI reticulated medical grade polyurethane foam or medical grade cotton to provide excellent particle entrapment. The open cell polyurethane foam gives the best solvent holding ability of any style of swab; cotton for tough cleaning jobs or are free of adhesives or binders that could contaminate your processes. Swab OAL: 3.2"; head OAL: 0.39"; head size: 0.11"; handle: polypropylene; head: polyurethane; pack: 500.